[SOLVED] Texture & PNMImage write method

C++ coding using Panda3D
1

hello ,

I am trying to write an auto generated image to disk.
I can succesfully create the file but they are all black and only 1kb (256x256) - which is ofc wrong.

here my code

PNMImage* pPNMImage = new PNMImage(256, 256, 4);

for (int y = 0; y < 256; y++) 
{
    for (int x = 0; x < 256; x++)
    {
      pPNMImage->set_red_val(x, y, redValue );
      pPNMImage->set_green_val(x, y, greenValue);
      pPNMImage->set_blue_val(x, y, blueValue);
      pPNMImage->set_alpha_val(x, y, 1.0f);
    }
}

PT(Texture) pTex = new Texture();
pTex->load(*pPNMImage);
pTex->set_magfilter(Texture::FT_nearest);
pTex->set_minfilter(Texture::FT_linear_mipmap_linear);
pTex->set_wrap_u(Texture::WM_repeat);
pTex->set_wrap_v(Texture::WM_repeat);
pTex->set_wrap_w(Texture::WM_repeat);

bool a = pTex->write(Filename("NewTex.png"));
bool b = pPNMImage->write(Filename("NewPNMImage.png"));

delete pPNMImage;

am I missing something ?

2

Yes, you are using the set_red_val() etc. interfaces, which expect a color value in the range 0…255 or whatever the maxval of the current PNMImage is, instead of the set_red() etc. interface, which expect a color value in the range 0…1.

So you are actually generating a black image.

David

3

nice one mate,
I completly overlooked this.

Problem solved :slight_smile: